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1.(noun): Zachary "Zack" Morris, the main character from "Saved by the Bell" 2.(verb): The act of doing something very outlandish and/or surprising that brings great joy to many people. (It can only be done by someone named Zack, Zach, Zak, etc.) 3.(noun): A nickname given to any "Zack" who is viewed as spontaneous or unpredictable by his peers.
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